Compatibility brief
Can Betta live with Otocinclus?
Caution. Check the issues below before buying.
Betta + Otocinclus: Temperament difference. Betta is semi-aggressive, while Otocinclus is peaceful. This can work with adequate space and hiding spots, but monitor for bullying. Outcomes still depend on your tank shape, maintenance routine, and individual fish.
Compatibility score
Profile confidence: medium
Order of checkstank volume vs adults → predation mouth gap → temperament / fin nipping → shared water windows.
60L
Combined minimum footprint reference for these two species: about 60L (larger active fish often want more length).
Temperament gap (semi-aggressive vs peaceful) — can work with space, structure, and careful observation, but not a “drop and forget” mix.
Assessment details
Temperament difference
Top issueBetta is semi-aggressive, while Otocinclus is peaceful. This can work with adequate space and hiding spots, but monitor for bullying.
Compatible temperature range
Both fish can comfortably share similar water temperatures.
“Betta is semi-aggressive, while Otocinclus is peaceful”
Temperament difference
Next steps
Concrete changes, not "research more" filler.
- •Provide plenty of hiding spots and visual breaks so Otocinclus can escape if harassed.
- •Otocinclus should be kept in a group of at least 4 for best health and behaviour.
Try instead
- →Provide plenty of hiding spots and visual breaks so Otocinclus can escape if harassed.
- →Otocinclus should be kept in a group of at least 4 for best health and behaviour.
- Seriously Fish. Betta splendens
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Betta splendens
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Betta splendens
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
- Wikipedia. Betta splendens
Encyclopaedia overview; use specialist aquarium sources for your stock's real temperature/pH/footprint needs.
- Seriously Fish. Otocinclus macrospilus (Otocinclus ‘affinis’ / trade oto stand-in)
Primary stand-in: SF profile for O. macrospilus. Shop 'O. affinis'/'otocinclus' labels are often misidentified. Verify the fish against a good key, not a single import sticker.
- FishBase. Otocinclus affinis
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Otocinclus affinis
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
- FishBase. Otocinclus vittatus
Taxonomy, distribution, and typical max length in natural/wild contexts (cross-check to aquarium import lines).
- Wikipedia. Otocinclus
Encyclopaedia overview; use specialist aquarium sources for your stock's real temperature/pH/footprint needs.
Try this next
Build the full stocking list with Betta + Otocinclus
Plan further
Try both species in the full-stock tank check, or open either fish profile for mates lists. Methodology explains how verdicts are produced.
Individual fish vary in personality. Fishori uses conservative hobby rules. Observe any new introduction closely, feed thoughtfully, and keep a quarantine or backup plan. This is not veterinary advice.
Profile data confidence: high. Based on multiple reputable aquarium care sources with strong agreement.